Lifting-jack.



WITNESSES PATENTED DEC. 17, 1907.

G. P. PREED.

LIPT'ING JACK.

APPLIGATION FILED MAR, 25, 1907.

INVENTOR k QMMW W, Q s (Um 7 .To all whom it may camera:

UNITED STATES GEORGE F. FREED, or ALLEGHENY, PENNSYLVANIA, ASSIGNOR'TOTHE FAOTURING COMPANY, or (ALLEGHENY, PENNSYLVANIA, A

PENNSYLVANIA.

Be it known-that IfGEORGE F. FREED, of 1 Allegheny, Allegheny county,Pennsylvania, have invented a new and useful Lift ing-Jack, of which thefollowing is a full,

v clear, and exact description, reference being had to the accompanyingdrawings, forming part of this specification, in which Figure 1 is aside elevation with the face plateremoved showing my improved form ofjack; Fig. 2 is a detail viewof the tripping plate; and Figs; 3 and 4are detail views of parts hereinafter referred to.

My invention relates to the class of lifting jacks which give a step bystep movement in either direction; and particularly to the well knownBarrett type of jack.

The object of the invention is to avoid the side thumb nut which hasheretofore been employed, and provide an improved reversing devicehaving operating means which extend and may be actuatedfrom the front ofthe jack.

' It is also designed to rovide a reversing lever which will .be with1nthe side limits of the frame.

In the drawings in which I show my invention as applied to the wellknown Barrett type of jack, 2 re resents the frame and 3 the lifting barwhic moves longitudinally therein. The frame is preferably provided witha flange 4 and socket 5 receiving the inner end of the operating lever6. This lever is pivoted on a pin 7 extendin through the sides of thesocket, and to sair lever at a point in front of the fulcrum is ivoted aawl 8 engaging the ratchet teet on the ar 3. The pawl or detent 9 ispivotally mounted on a pin lflpassing through the sides of the socket,this detent being outside of the pawl 8 and engaging the bar teeth aboutit. The pawls 8 and 9 are normally held in engagement with the ratchetteeth the lower ends thereof inwardly or to the left, as shown in Fig.1but as the outward movements of the upper ends are preventedSpecification of Letters Patent.

A plication filed mmh 25.1907. Serial No. 864.285.

placed coil springs, one end ofmma;

Patented Dec. 1"7',.1 oo7. 'f

the levers are forced inwardly or to the left, thereby moving the awlsinto engagement with the ratchet-teeth on the bar 2.

In the lifting-jack constructed as herein; before described, theliftingbar is raised during the downstrokev of the operatinglever 6, andheld in such raised position by the pawl ordetent 9 durin the upstrokeof said lever, the pawl 8 and detent 9 being bar by the spring-levers 11and 12.

In order to lower the bar or permit the" movement under the action ofthe load,.jthe above-describedoperation of the pawls must be held awayfrom the bar 2 during the upstroke of the operating-lever and caused toengage one of the teeth of the bar at the end of such stroke, While thepawl 8 must he held stroke of the lever, and at. theendfof L downstrokemust engage one of the teeth of, the bar 2 and retain such engagementuntil .the end of the upstroke, when it is forced out of en a ement withthe ratchet-teeth again; It will e'understood that the outer end io fthe lever 6 is referred to in the above state; ments as to thedirections of the strokfe i: This reversal of the normal operation ofthe pawl and detent is effected by the tripping face with a pro ection17'having a suitably' shaped cam surface for engagement with the lowerend ofthe lever 11, and with a bearing-point or stop 18 for engagementwith the auxiliary or releasing lever 19, piv- ,oted on the lower end ofthe lever 12, as eshown in Fig. 1. 1

The tripping plate 16 is pivoted to the abutment of the frame at 16, andits lower forward end is formed with a nose 20 which is supported by astar wheel 21. This wheel has a series of teeth or projections, the apexof each of which is preferably formed with a slight indentation 22 toretain the-nose of the tripping plate, and between these two adjacentteeth is a depression 23 in which the nose of the tripping plate is alsoadapted to rest. The star wheel 21 is loosely mounted ona stud 24, andhas secured thereto a ratchet P1ate Big 2), provided on its inner and aprojection 15 on the fever 11 hearing against the lever 12, the lowerportions of held against the ratchet-teeth of the liftingbe reversed, i.0., the pawl or detent 9 must away from the ratchet-teeth during thedown9h.

Wheel 25, the teeth of which are arranged to be engaged by pawl 26 whichis pivoted to alever arm 27'loosely fulcrunied on the stud 24. A spring28 is coiled to the stud 24 with one of its ends connected to the leverarm and its other end to a fixed pin or stud 29. Attached to the leverarm is a cord, chain, or link 30 which extends thro h a guiding eye orlug 31 of the frame, in a i'rection parallel to the operating lever.

When lifting the bar step by step, the parts are in the position shownin Fig. 1, with the nose of the tripping plate resting in the depressionbetween two of the teeth of the star wheel. When it is desired toreverse the operation for the purpose of lowering the bar ste by step,the chain, link, or cord, 31 is pu led, thereby causing the operation ofthe pawl and ratchet to move the star'wheel a suificient distance'tocause the nose of the tripping plate toride on to the top of the nextadjacent tooth; This forces the tripping late upwardly and toward theright, there y bringing the projection 17, and the bearing-point on thestop 18 into operative relation with the lever 11 and the auxiliary orreleasing lever 19, thereby efiecting a reversal of the pawls. Anotherpull on the chain or cord 31 will permit the tripping plate to drop intoone of the depressions of the star wheel which returns the parts totheir former position for lifting the bar.

The lifting and lowering movements of the bar will be obvious, being thesame as in the ordinary Barrett jack. The feature of my inventionconsists in the novel form and arrangement of the tripping plate inconnection'with the reversing mechanism therefor,

which may be operated from the front of the jack.

" The advantages of my invention result from the provision of reversingmechanism which may be actuated from the front, there'- by obviating thenecessity for reaching through a wheel when the jack is used inconnection with automobiles or other vehicles; The construction also enits the jack ens ing to be placed along the side wall or otherobstruction which would prevent access to the ordinary reversing buttonat the side of the Barrett jack.

Various changes may be made in the form and arrangement of the trippingplate, and of the reversing mechanism therefor, without departing frommy invention, since What I claim is:

1. In a step by step raising and lowering jack, a tripping plate, arotatable member adapted to hold said platein either one of twopositions, and means for actuating said member to rotate it in onedirection only; substantially as described.

2. In a'step by step raising and lowering jack, a tripping plate,atoothed reversing wheel therefor, and means for rotating the Wheel;substantially as described.

3. In a step by step raising and lowering jack," a tripping plate, atoothed reversing wheel therefor, lever and pawl and ratchet mechanismfor operating s'aid wheel, and meansfor operating the lever;substantially as describec. i

4-. In a jack of the Barrett type having step by step raising andlowering mechanism, a pivoted trilpping plate, a star wheel arranged toho d the tripping plate in either one of two positions, and means foractu-- ating said wheel from the front of the jack; 7

substantiallyas described.

5. In a step bystep raising and lowering jack, a trip ing plate, arotatable member adapted to old said plate in either one of twopositions, said member having a plurality of plate actuating Iprojections, and means for actuating said member to rotate it in onedirection only; substantially as described.

In testimony whereof, I have hereunto set my hand.

GEORGE F. FREED.

, Witnesses: I

J. 0. Jamison, A. E. Ass.

